Sarmentose shrub 0.7–5 m high, or more often a liana, 1–12 m long, ?evergreen; trunk to 2.5 cm in diameter; branches reddish or purple-brown, lenticellate; branchlets brown, glabrous or rarely scabrid; latex clear or white. Leaves opposite, petiolate, blade elliptic or ovate to obovate, 2–19 cm long, 1.5–7.5 cm wide, base cuneate, rounded or rarely subcordate, apex acuminate, glabrous or rarely scabrid; petiole 2–14 mm long. Inflorescence terminal or in forks, 1–48-flowered, sessile or pedunculate, lax, minutely puberulous or rarely glabrous in all parts; pedicels 4–25 mm long. Flowers fragrant, white, turning yellow and then orange, suffused with red near the mouth, spotted and streaked with red inside; sepals unequal, the outer ovate, the inner linear, 4–25 mm long, acute or obtuse; corolla tube 12–26 mm long, corolla lobes ovate, 4–12 mm long, 3.5–10 mm wide, narrowing into the 12–18 cm long pendulous tails, corona lobes 1–2.5 mm long. Fruit dark brown, hard, the mericarps ± opposite-divergent, ± cylindrical, 15–29 cm long, 1–3 cm in diameter, tapering and ending in a knob, sulcate, lenticellate, glabrous; seeds 12–20 mm long, densely puberulous to pubescent, with a shortly beaked coma 6–10 cm long. Fig. 28 (p. 83).